Science

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Across
  1. 3. can be observed without being changed
  2. 7. liquid turning into vapor
  3. 9. one kind
  4. 12. a gas
  5. 14. a group of atoms held by covalent bonds
  6. 15. changes
Down
  1. 1. siblings of atoms
  2. 2. substance turning into a new substance
  3. 4. space
  4. 5. measurement
  5. 6. temperature whicha liquid boils
  6. 8. smallest unit
  7. 10. doesnt change
  8. 11. force
  9. 13. where elements are located